Space: They produce significant waste and need room to grow. A single goldfish typically requires at least 20–30 gallons; small bowls are detrimental to their health.
Filtration: Due to high waste production, a strong filtration system is mandatory to prevent toxic ammonia buildup.
Temperature: They are coldwater fish, thriving best between 65–75°F (18–24°C).
Diet: As omnivores, they benefit from a mix of specialized pellets, flakes, and occasional treats like shelled peas or leafy greens.